Removing and installing Y-pipe: Audi A8 D4 (CDSB, CTEC)
Step-by-step removing and installing Y-pipe for the Audi A8 D4 (CDSB/CTEC): 11 steps. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A8 D4 (4H, 2010–2017)
- Renewed: gaskets
Don't miss
- Disregard (item 3).
- Disregard (item 1).
📋 Procedure
- ⚠ When working on all parts of the exhaust system:Observe safety precautions when working on the exhaust system . — Remove rear noise insulation (2)General body repairs, exterior66Noise insulation; Removing and installing noise insulation.
- Remove rear section (4) of front wheel housing liner (left-side) General body repairs, exterior66Wheel housing liners; Removing and installing wheel housing liner (front).
- Remove particulate filter .
- Remove plenum chamber partition panel General body repairs, exterior50Bulkhead; Exploded view - plenum chamber partition panel.
- Unplug electrical connector (2).
- Release retaining clip (1), detach injector for reducing agent N474 and place to one side. [Note: Disregard (item 3).]
- Remove NOx sender G295(item 1).
- Remove union screw (2) and move pressure pipe for clutch temperature sender G509 clear. [Note: Disregard (item 3).]
- Unscrew bolt (2) and nuts (3, 4) and detach Y-pipe upwards. [Note: Disregard (item 1).] [Note: Renew gaskets and self-locking nuts.]
- Align the exhaust system so it is free of stress .
- Install particulate filter .
Other AUDI procedures
- Removing and installing particulate filter (right-side) - vehicles up to model year 2013
- Removing and installing mounting plate for engine oil cooler, pressure control valve and oil filter housing
- Removing and installing coolant pipe (top front) – Audi A3
- Removing and installing rotational speed sender 1G653
- Removing and installing particulate filter (left-side) - vehicles up to model year 2013
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.